题目

阅读下面短文，掌握大意，然后从1-20各题所给的四个选项（A、B、C和D）中，选出最佳答案。 As for daily life, I think that we will be able to 1most of our shopping by 2and this will be taken to our homes, so3there won't be any4to go out to the 5. I'm sure that most of our homes will have a video 6so we will be able to 7the person we are talking to. We will also be8 holovision which will give you three dimensional( 三维的 ) life size picture 9your screen--this will replace television. 10important technology, there will be no more road accidents. Cars will be 如图表示有限环境中某一种群增长的曲线．下列有关叙述正确的是（ ）①K值是环境条件所允许达到的种群数量最大值；②在K值时，种群的增长率最大；③如果不考虑迁入迁出等其它因素，理论上在K值时出生率等于死亡率；④假设这是鱼的种群，当种群达到K值时开始捕捞，可持续获得最高产量．A.①②B.①④C.①③D.③④